Sorry for the late reply, I think the problem might be on the Horde Mode addon's side, I use the Zombie Invasion addon, it works fine with it.
Unfortunately, I'm not really into addons, so that's all I can say, sorry! :(

every time I spawn the npcs (I've been using horde mode and this happens as well) the npcs dont chase you or walk around they stay static and when you coax them to follow you they just run a couple yards and stop. Thanks for the response.

What's the problem with it?

please update this